How much would it cost...

50/50 · 14 Apr 2007 at 21:30

... for the electricity to keep a source of 400w running 24/7 for 65 days?

dsb · 14 Apr 2007 at 21:31

depends how much you pay per unit.

JIM_BOB7813 · 14 Apr 2007 at 21:33

65 days is 1608 hours
0.4watts * 1608 =643.2 kw-hours
so 9 pence per unit? or 12? cant remember, but X*643.2

edit: calculator failed me :<

[TR]SweetSpotOz · 14 Apr 2007 at 21:33

Werewolf · 14 Apr 2007 at 21:34

624 x whatever you pay per unit.

50/50 · 14 Apr 2007 at 21:35

Im with british gas, I havent got a clue what the basic rate is! Anyone know? thx

edit/ nm found it

[TR]SweetSpotOz · 14 Apr 2007 at 21:37

50/50 · 14 Apr 2007 at 21:37

markyp23 said:
If this is about a computer, there is no chance that it will consume 400W all the time.

No, something else

Sleepy · 14 Apr 2007 at 21:41

How efficient is the 400W device. A PC power supply (70% efficient) outputs 400W but actually uses 400/0.7 = 570W of electricity.

[TR]SweetSpotOz · 14 Apr 2007 at 21:42

Sleepy · 14 Apr 2007 at 21:50

markyp23 said:
But it only draws as much as it uses.

Can't that violates the Laws of Thermodynamics. Nothing is 100% efficient

fini · 14 Apr 2007 at 21:57

I think what he's saying is that, whilst what you've said is true you are presuming that the PSU is maxed out constantly. Imagine you have a 400W PSU running a 80mm fan and that is it - would it still draw 570W? No, because it would not be trying to supply 400W.

fini

JaFFa · 14 Apr 2007 at 21:59

yer thats right , the wattage is the peak output of the psu, it wont draw that all the time. There are calulators on the web for this sort of thing. Go ask on the Seti part of the forum for better replies.

Sleepy · 14 Apr 2007 at 22:01

fini said:
I think what he's saying is that, whilst what you've said is true you are presuming that the PSU is maxed out constantly. Imagine you have a 400W PSU running a 80mm fan and that is it - would it still draw 570W? No, because it would not be trying to supply 400W.

Agree, though even at zero load a transformer uses power.

daz · 14 Apr 2007 at 22:04

Sleepy said:
How efficient is the 400W device. A PC power supply (70% efficient) outputs 400W but actually uses 400/0.7 = 570W of electricity.

Other way around...

A advertised 300W supply might only be 70% efficient and only able to supply 210W.

[TR]SweetSpotOz · 14 Apr 2007 at 22:04

Fraggr · 14 Apr 2007 at 22:23

Sleepy said:
Can't that violates the Laws of Thermodynamics. Nothing is 100% efficient

Electric heater.

fini · 14 Apr 2007 at 22:44

- delete me -

Fraggr · 14 Apr 2007 at 22:45

Ninja edit!

Sleepy · 14 Apr 2007 at 22:50

Fraggr said:
Ninja edit!

but not faster than email notification.